Given a text, write a compressed version of it in a single sentence.

The fourth row, labeled "Subtotal" shows the First-Class household mail as the sum of mail in the above three sectors. This is the First-Class Mail either sent or received by all households and is subject to analysis by HDS.
The fourth row, labeled "Subtotal" shows the First-Class household mail either sent or received by all households and is subject to analysis by HDS.